Revolving vacuum-filter for recovering the liquid from slimes, sands, pulp, or such like in connection with cyanid or other chemical applications.



No. 706,920. Patented Aug. l2, I902. O a. FRASER, m; a s. E. FRASER. REVOLVING VACUUM FILTER FOR BECOVEHING T l-IE LIOUID FROM SLINIES, SANIDS,

' PULP, OR SUCH LIKE IN CONNECTION WITH CYANID OR OTHER CHEMICAL APPLICATIONS.

(Application filed Apr. 18, 190?.)

.(No Nodal.)

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No. 706,920. v Patented Aug. {ZN-I902.

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G. FRASER LTEB FOR RECOVEBIQNG THE LIO.U PULP, 0R SUCH LIKE IN CONNECTION WITH CY m FROM sumss, s-nnos; ANID on OTHER REVOLVING VACUUM Fl CHEMICAL APPLICATIONS. (Application filed Apr. 18, 1901.)

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GEORGE FRASER, 1a.,

ATENT OFFICE."

OF AUCKLAND, AND SAMUEL EDGAR FRASER, OF

WAIKINO, NEWV ZEALAND. I

REVOLVING VACUUM FILTER FOR RECOVERING THE LIQUID FROM SLIMES, SANDS, PULP, OHIYSUCH LIKE IN CONNECTION WITH CYANID R OTHER,CHEMICAL APPLICATIONS.

SPECIFICATION forming part of Letters Patent No. 706,920, dated August 12, 1902.

slimes, sand, pulp, and such like in connection with cyanid or other chemical applications, of which the following is a specification.

This machine, as its title indicates, is for recovering the liquid from slimes,sands, pulp,

I and such like in connection with cyanid or other chemical application. It consists of a cylinder with aperforated surface covcred by porous material. The interior of the cylinder is under constant vacuum when in operation. The porous material as thecylinder is made to revolve absorbs the pulp from the box beneath the machine and a displacement-wash is supplied to the upper por tion of the cylinder by trailingblankets, while the liquid is drawn away through an internal stationary pipe and the residue is stripped from the filter-cloth by an adjustable or fixed knife. I i

The accompanying drawings show three figures, of which I I Figure 1 is a front sectional elevation of the machine. Fig. 2 is a plan of the machine, and Fig. 3 is an end section.

The machine consists of cylinder A, with a perforated surface U, as partly shown in Figs. 1 and 3. The interior of thecylinder is under constant vacuum when in operation. The ends B are adjusted to the trunnion-shaft C and with it rotate in the bearings D. An internal stationary pipe E is provided for vacuum connection and for drawing off the liquid from thcinterior. Porous material F is fixed as a filter medium upon the outer surface of the cylinder A, so as to form a fixed Application filed April 18, 1901. Serial No. 56,513- (No model.)

rial H from the supply-trough S. A knife I, hinged on metal holder L, is provided to re move the residue from the filter cloth F. This holder L is swung on a suitable bracket M, attached to the frame N, in which the whole machine is set. ,Pipes P are provided for drawing oif the liquid from the interior of the cylinder A, and retaining-boards R serve to holdthe liquid, so that the pipes P can carry it around into the trunnion-shaft C.

The cylinder A is made to revolve by means of any suitable form of driving-gear, and a vacuum is formed inside of it. The lower portion of the cylinder A, with the filter cloth or medium F, by the constant rotation is always in the slime or pulp G Within the box T, and the cloth F is thereby continually absorbing the slime or pulp, thus making the feed automatic, and by the vacuum within the cylinder A. the liquid in the slime, pulp, -or such like is drawn from the cloth F through the perforated surface U to within the cylininder A, while the solids adhere to the outside of the filtencloth F, which solids will ,vary. in thickness, according to the speed the cylinderA is made to travel through the pulp G and the strength of the vacuum. The cylinder A thus rotating is continually presenting a fresh surface of the filter-cloth F to the remaining slime or pulp. The machine can be so regulated in speed that by the time the cylinder A has rotated around to the displacement-wash at its top part the liquid or moisture of the pulp Gr adhering to the filtersurface F will have been drawn off towithin about thirty per cent. of absolute dryness. At this stage the displacement-wash supplied from the trough S is conveyed by capillary attraction, by means of trailing blankets or such like H, to the upper portion. of the cylinder, as shown in-Fig. 3, to properly saturate the semidry material on the filter-cloth F, and by the time the cylinder A has rotated around to the point of discharge the adj us'table knife-' blade I strips the residue on the filter-cloth F from it, the knife I being set up close to the surface of the cloth'F for this purpose, but so as not to out it. The filter-cloth surface being thus cleaned it is again ready to pass into the pulp G, and. in this way continuous treat to pass therefrom and along the more or less hollowed-out support S on which said trough rests, whereby such wateresoaks into the blankets H and through the same reaches the filtering-cloth F, as hereinbefore set forth.

The part W (marked on Fig. 3) is a recess for calking the end of cloth F. v

The pipes P (shown in Figs. 1 and 3) are fixed to theshaft C and are located inside of the cylinder A and are for drawing off the liquid that has been drawn or filtered through the filter-cloth surface F tothe interior of the cylinder A. Shown projecting downwardly in Fig. 3 is a retaining-board R, which serves to carry the liquid around for a sufficient length of time for the pipeP to allow theliquid to be drawn into the trunnion-shaft O by the vacuum, from whence it passes through the stationary pipe E on to the receiver.

Though the knife I" is shown in drawings as adjustable, it can be either adjustable or fixed, as may be found most suitable.

Having fully described our invention, what we desire to claim and secure by Letters Patcut is 1. The combinationof a peripherally-perforated cylinder, a trough in which said cylinder is mounted to rotate, one or moreblankets arranged to trail upon the periphery of said cylinder, and means for applying water to saidblanket or blankets.

2. The combination of a peripherally-perforated cylinder, a trough in which said cylinder is mounted to rotate, one or moreblankets arranged to trail upon the periphery of saidcylinder, means for applying water to said blanket or blankets, and a knife arranged between vthe blanket or blankets and "the trough and adapted vt0 scrape said p e-' riphery. V I

3. The combination of a peripherally-perforated cylinder, a trough in which said cylinder is mounted to rotate, one or more'blankets arranged to trail upon the periphery of said cylinder, means for applying water to said blanket or blankets, a hollow shaft for supporting said cylinder, and a plurality of pipes extending from said shaft and opening into the cylinder.

GEORGE FRASER, JUNIOR; SAMUEL EDGAR FRASER.

' Witnesses:

GEORGE WILLIAM BASLEY, PERCY HERBERT BASLEY. 

